title: Retroperitoneal tumors and lymphadenopathy.
abstract: The retroperitoneum is the space between the parietal peritoneum anteriorly and the transversalis fascia posteriorly. Most retroperitoneal tumors arise from mesenchyme, neurogenic tissue, or embryonic rests. By this definition and by including lymph nodes as a retroperitoneal organ, lymphoma is not considered a primary retroperitoneal tumor.
authors.affiliation: Department of Radiology/NUC Med, Uniformed Services University of the Health Sciences, Bethesda, Maryland 20814-4799.
authors.forename: D S
authors.initials: DS
authors.lastname: Hartman
mesh_terms: D006801:Humans; D008198:Lymph Nodes / Q000000981:diagnostic imaging / Q000473:pathology; D008206:Lymphatic Diseases / Q000175:diagnosis / Q000000981:diagnostic imaging*; D008279:Magnetic Resonance Imaging; D012186:Retroperitoneal Neoplasms / Q000175:diagnosis / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed